The gonadal status of the spawners of northern malma, Salvelinus malma, white-spotted charr, S. leuconaenis, and their hybrids in the Utkholok River in the framework of the between-species hybridization problem in charrs of genus Salvelinus (Salmonidae)
- Authors: Kuzishchin K.V.1, Emel’yanova N.G.1, Gruzdeva M.A.1
-
Affiliations:
- Lomonosov Moscow State University
- Issue: Vol 64, No 5 (2024)
- Pages: 562-577
- Section: Articles
- URL: https://journals.rcsi.science/0042-8752/article/view/282990
- DOI: https://doi.org/10.31857/S0042875224050032
- EDN: https://elibrary.ru/QYTONO
- ID: 282990
Cite item
Abstract
The investigation of gonads in spawners of white-spotted charr, Salvelinus leucomaenis, northern malma, S. malma and their hybrids was evaluated by the macro- and microscopic approach. The data was obtained from the mature fish after their spawning period in the Utkholok River (North-West Kamchatka). No any remarkable deviations in the gonadal structure as well as in the cytological status were found in all three groupings. In all three groupings germ cells of subsequent generations were found in the generative tissue of the testes and ovaries, which indicates the ability of spawned individuals to re-mature and reproduce the next spawning season. The gonadal condition of hybrid individuals fully corresponds to that of polycyclic salmonid fish and does not differ from the parental species – malma and white-spotted charr, their gametogenesis proceeds without visible deviations. This indicates the potential ability of hybrids in the Utkholok River to reproduce multiple times and maintain their own population, unlike many other cases of interspecific hybridization in salmonids described in the literature. The data obtained on the state of the gonads and the results of the genetic analysis of hybrids carried out earlier indicate such an important feature of the hybrid zone “Utholok River” in charrs of the genus Salvelinus as the transition of the entire system to the state of the so-called “hybrid swarm”. In this regard, a scenario is likely when hybrids can move to the next stage of microevolutionary processes, leading them to isolation from their parent species.
About the authors
K. V. Kuzishchin
Lomonosov Moscow State University
Author for correspondence.
Email: KK_office@mail.ru
Russian Federation, Moscow
N. G. Emel’yanova
Lomonosov Moscow State University
Email: KK_office@mail.ru
Russian Federation, Moscow
M. A. Gruzdeva
Lomonosov Moscow State University
Email: KK_office@mail.ru
Russian Federation, Moscow
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